st: Unable to get mfx, predict(p) after mim: svy: logit

I am trying to get the estimated marginal effects after running a logit regression with multiply imputed data, but am getting an error message stating that option (p) is not allowed. Here is the code I am using:
svyset [pw = wt];
mim, storebv: svy: logit y z `othercontvar';mfx, predict(p) varlist(z) level(90);
I couldn't find any documentation specifying that the "p" option (probability of a positive outcome) is not available for predicting in mfx after running mim: svy: logit. Does anyone know if the option is really not available? Also, why not?
I would really appreciate any insight on this issue.
Arif Mamun
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